Medium severity · published Jul 21, 2026
CVE-2026-47254
libheif Has Heap Buffer Overflow in `Track::get_next_sample_raw_data()` -- OOB Chunk Vector Access
6.1
CVSS
0.2%
EPSS
No
On KEV
Description
libheif is a HEIF and AVIF file format decoder and encoder. Prior to version 1.22.0, `Track::init_sample_timing_table()` in `libheif/sequences/track.cc` stores an out-of-bounds chunk index (`m_chunks.size()`) into `m_presentation_timeline` when the number of chunks defined in the `stco` box is less than the number of samples in `stsz`. A subsequent call to `heif_track_get_next_raw_sequence_sample()` reads `m_chunks[chunk_idx]` with that OOB index, causing a heap-buffer-overflow. Version 1.22.0 fixes the issue.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 5% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
libheif · strukturag
< 1.22.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-47254
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-47254
Exploit
https://github.com/strukturag/libheif/security/advisories/GHSA-wqjg-4x9g-6cvg
More from libheif
9.8
CVE-2026-84383
libheif: Heap buffer overflow in `scale_nearest_neighbor()` via duplicate Alpha planes from nested `iden`/`auxl` items
8.8
CVE-2026-32740
libheif: Heap-Buffer-Overflow Write in Grid Tile Chroma Compositing
8.7
CVE-2026-62292
libheif: Out-of-bounds read in uncompressed unci tile range slicing
8.1
CVE-2026-41071
libheif: Heap buffer over-read in SampleAuxInfoReader via crafted HEIF sequence file with mismatched saiz sample count
7.8
CVE-2026-47178
libheif has Heap Out Of Bounds Write in unci subsystem